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Tag: FDC

Disk on Spec

µPD765A Disc Controller – Primer

The µPD765A was a prevalent Floppy Disk Controller for many a home computer in the 80's. The Amstrad CPC was no exception. This is a primer for Writing Z80 assembler to access the controller direct. that I'll use for later articles on old school hacking. Want to know more?

DiscSys – XOR

DiscSys was a commonly used Disk Protection format in the 80s for the Amstrad CPC. For a protection system it was very basic, relying on modifying track and sector information to non standard formats to prevent copying with the supplied tools. Though it was very trivial to bypass the protection system and copy the disk anyway. Whilst reminiscing about the past, I discovered a small flaw with implementation in the game XOR, here's what I found...